My brother(17) and I both have a very athletic build. It started the night before when I had a semi hard on and my older bro saw the bulge in my boxers. He looked at me and I was like in the morning. The next morning I woke up and told my bro go upstairs. I then went up a few minutes later as to not draw any attention to the two of us. When I got up there he was sitting on the bed only in his boxers since he had just gotten out of bed. I was dressed the same. He told me to come over and then he pulled me on his lap and I could feel his dick against my butt. He then started to rub my chest and slowly moved his way down to my lower stomach. It felt so good.
He then started to rub my semi hard on, as he did I got hard almost instantly. He then pulled down my boxers and played with my balls. When he saw my dick he commented on the nice size (7in) as he did so he grabbed some lube and poured it all over my lap. He then grabbed my dick and started pumping alternatively between slow and fast. I was in such ecstasy it was amazing. He then started to grip my butt and I was in shock it felt so good. As he did this I rubbed my body forward and back so he could be pleasured too, this went on for some time as every time he could tell I was getting close to cumming he would stop and I would stop as well.
I was breathing so heavy from the constant feeling radiating from my dick. He then did something very unexpected, he slipped his thumb up my butt and I was pushed over. I cummed as soon as he did all over my lap and the bed. I then pulled him onto my cummy lubricated lap and pulled off his boxers. He had an amazing hard on, it was about nine inches. I was amazed. I poured lube all over him and grabbed his dick. He had already been through just as much as me so I pumped hard and fast and he cummed within the minute. After that we went into the shower together to wash up and have a lil more fun. We plan to try to do this more often.